Android Question Starting service after the process is killed

hookshy · Jan 17, 2016

If I enter the aplications in my phones and stop the process my services not start anymore ....
My service is scheduled to restart with
StartServiceAt("", DateTime.Now + DateTime.TicksPerSecond*120 ,True)
service_destroy is not called in this case
Service_destroy is called only if I go to running apps , track the service and hit stop .

Another issue is:
If I have boolean values that are defined as process globals in main activity and saved to disk , when my process starts I have to read the variables from disk in service_start sub in order to read the correct state of the variable
I have fixed the problems and in the future I will start developing from Service Starter with b4a v5.20

Q: how can I manage a reliable service module for critical operation like : receiving sms ...if the process is killed (from installed app not from running apps ) then the service may not start at all , or if it if the service is killed then can I start the service right away in service_destroy ?

Erel · Jan 17, 2016

hookshy said:
If I enter the aplications in my phones and stop the process my services not start anymore

That's right. This is how Android works. If the user explicitly kills your app then there is nothing that you can do to start the process again. Only the user can start it again.

lemonisdead · Jan 17, 2016

hookshy said:
how can I manage a reliable service module for critical operation like : receiving sms

By registering an intent receiver in the Manifest, perhaps ?

hookshy said:
if the process is killed (from installed app not from running apps ) then the service may not start at all , or if it if the service is killed then can I start the service right away in service_destroy

By installing a second app sending an itent on regular schedules to the service which has to be running, perhaps ?

hookshy · Jan 17, 2016

Erel said:
That's right. This is how Android works. If the user explicitly kills your app then there is nothing that you can do to start the process again. Only the user can start it again.

Thanks , this seems resonable since it depend only on user action ...and most of the task killers does not stop the process but closes all activities and services

hookshy · Jan 17, 2016

lemonisdead said:
By registering an intent receiver in the Manifest, perhaps ?

I do not know if there is any diference from this solution
Intent Filters - Intercepting SMS messages in the background
and
Phone library with sms interceptor (this solution I am using in my app)
I guess the phone library depends on a service running , is the service started automaticaly when the sms arrives ?

hookshy · Jan 17, 2016

I have a device huawei ascend y530 with jelly bean
Pressing long on menu will start build in task killer , the service_destroy is not called in this case ?
problem is that I do not understand what this killer does to the app ..process globals from main activity are reinitialised to default ...meaning that the process is killed ...and it includes the services also ...do not know

If I enter running services from app settings then the service_destroyed is called after pressing stop service

lemonisdead · Jan 17, 2016

hookshy said:
is the service started automaticaly when the sms arrives ?

Yes when you register the intent receiver from the Manifest, the service is started automatically (or restarted if already running)

hookshy · Jan 18, 2016

lemonisdead said:
Yes when you register the intent receiver from the Manifest, the service is started automatically (or restarted if already running)

Thank you , testing right now and passing to the Erel's tutorial intercepting sms in the background

Erel · Jan 18, 2016

hookshy said:
and most of the task killers does not stop the process but closes all activities and services

This is no longer true. If the user swipes your app from the recent apps list then it will be killed and will not start until the user starts it again.

hookshy · Jan 23, 2016

Erel said:
This is no longer true. If the user swipes your app from the recent apps list then it will be killed and will not start until the user starts it again.

yes I have tested this also on another device , is this the reason you added Startup Service ? ...
I have changed recently to intercepting sms in the backgbound and registered the internt sms receive ...but it seems I have a problem with the sms notification first time after i swipe the recent items and close the process the sms notification that was supposed to show up when the sms service starts does not show up ... The second sms wakes up the process ...I will double ceck this and come back

Erel · Jan 24, 2016

hookshy said:
is this the reason you added Startup Service ?

No, it is not related to the starter service.

hookshy said:
but it seems I have a problem with the sms notification first time after i swipe the recent items and close the process the sms notification that was supposed to show up when the sms service starts does not show up

This is exactly the result of this new security / protection feature. Once the user killed your app there is nothing that can be done to start the process without the user intervention.

hookshy · Jan 24, 2016

Erel said:
This is exactly the result of this new security / protection feature. Once the user killed your app there is nothing that can be done to start the process without the user intervention.

I understood first time when the users killed the app from installed app ...but swiping the recent apps allows the processes to start again when skeduled with startserviceAt ...and in particular if the user sends the second sms the service wakes up ...so the process is still waken by the sms received intent

xpectmore · Jan 7, 2017

I know is later ... but still.... looking to the answer to your problem(cause i am still b4a beginner,java 0 =i'll never learn java) .. i found the answer ,i mean Erel did in da past .thanks Erel for https://www.b4x.com/android/forum/t...-long-running-background-tasks.27065/#content still works!
is about #StartCommandReturnValue: android.app.Service.START_STICKY

here is a small example will set allways vibrations instread sounds on your andoid phone.
(on my phone with android 6.0.1 if i set vibrations instread sounds after any call the phone app will set sounds overriding my settings so treat this experiment like a fix for my phone with android version)

i compiling this using android targetSdkVersion="19" on an android 6.0.1 and works !

the libraries are core and phone ...see on the right side-bottom da book then you may activate phone library(for begginers ninja )
in the main

B4X:

#Region  Project Attributes 
	#ApplicationLabel: CUSTA-mizable
	#VersionCode: 1
	#VersionName: 0
	'SupportedOrientations possible values: unspecified, landscape or portrait.
	#SupportedOrientations: unspecified
	#CanInstallToExternalStorage: True
#End Region

#Region  Activity Attributes 
	#FullScreen: False
	#IncludeTitle: False
#End Region

Sub Process_Globals
	'These global variables will be declared once when the application starts.
	'These variables can be accessed from all modules.

End Sub

Sub Globals
	'These global variables will be redeclared each time the activity is created.
	'These variables can only be accessed from this module.
	Activity.Finish
	
End Sub

Sub Activity_Create(FirstTime As Boolean)
	'Do not forget to load the layout file created with the visual designer. For example:
	'Activity.LoadLayout("Layout1")

End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

in the service starter i use

B4X:

#Region  Service Attributes 
	#StartAtBoot: True
	#ExcludeFromLibrary: True
	#StartCommandReturnValue: android.app.Service.START_STICKY
#End Region

Sub Process_Globals
	'These global variables will be declared once when the application starts.
	'These variables can be accessed from all modules.
Dim p As Phone

Dim vl As Int
Dim timer1 As Timer
End Sub

Sub Service_Create
	'This is the program entry point.
	'This is a good place to load resources that are not specific to a single activity.

End Sub

Sub Service_Start (StartingIntent As Intent)

timer1.Initialize("Timer1", 500)
timer1.Enabled = True
End Sub

'Return true to allow the OS default exceptions handler to handle the uncaught exception.
Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
	Return True
End Sub

Sub Service_Destroy

End Sub


Sub Timer1_Tick

'If p.GetVolume(p.VOLUME_RING)>0 Then
'	p.SetVolume(p.VOLUME_RING, 0, True)
'	pp=False
'End If
	'delay
'
vl = p.GetVolume(p.VOLUME_RING)
If vl>0 Then
'Log("da")
p.SetVolume(p.VOLUME_RING, 0, True)
Else
'Log("nu")	

End If	
'Log(vl)
End Sub

how this work ? if pushing volume in android 6.0.1 will popup da bar then touching quick da arrow on da right of percents of voume then will popup a new small window ,then if you try to set ringtone to other values >0 the service will put it to 0 that's meaning "to vibrate".if you try to kill my app from recent apps this will kill activity and the service will live in backgroung.the unique way to kill it is settings / applications/application manager/the name you choose to try this in my case is CUSTA-misable\and Force stop and when popup confirmation force stop again.
the seccond way is simple as uninstall from the same place.[/code]

Erel · Jan 8, 2017

1. Please use [code]code here...[/code] tags when posting code.
2. Please start a new thread for this question.

Mahares · Jan 8, 2017

Erel said:
Please use

B4X:

code here...

tags when posting code.

If I had a penny for each time @Erel uses the above sentence in his response, I would accumulate a fortune.@Erel: Is there a way the 'Questions' forum script can detect when someone posts code and neglects to use code tags, especially when the code is lengthy, and refuse to post until tagged. Sorry for posting this in the wrong forum, but it gets more exposure here..

Erel · Jan 9, 2017

This is indeed not the correct place to discuss it. I might add such a feature in the future.

xpectmore · Jan 9, 2017

isn't our fault if your website script is incomplete ... how i can know your tags are active , there is no relate to this when we comment.
maybe is time you write some code to the website too .. i am customer to purebasic too if you need suggestions about proffesional forum for real programmers go to http://www.purebasic.fr/english/ and you'll see any coment you do is showing first and people will know when someone coment. that's purebasic progress so why shouldn't be the same with b4a ?
chop chop ...

lemonisdead · Jan 9, 2017

What is cheap ?

xpectmore · Jan 9, 2017

Cheappy is a savage rat
That can handle a red hat :
- "chop chop ... i still got..
the right answer is his cheecky hot .. "

he he he he he he he he he he

Erel · Jan 10, 2017

xpectmore said:
isn't our fault if your website script is incomplete

Nobody said that it is your fault. Nothing bad happened. Now you know that next time you should use code tags.

Android Question Starting service after the process is killed

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